Deslocamento miscível de um efluente de indústria de explosivo em colunas de solo

this study evaluated some impacts due to the miscible displacement of an explosive industry effluent applied to a b horizon of an udox soil (la-b) under the following treatments: additions of carbonate (base), acid (acid), phosphate (fosf), carbonate and phosphate (base-fosf) and acid and phosphate (acid-fosf). nitrogen recovery compared with the total amount applied varies from 10.1% (acid) to 65.5% (base). there is correlation between experimental and fitted breakthrough curves for the most columns (p<0.001). the unique exception occurs to acid-fosf (p=0.202). there is no correlation between soil net electrostatic charge (nec) and the model adjusted variables: retardation factor (fr), dispersion-diffusion coefficient (d) and first-order decaying rate (μ). phosphate adding (fosf) favors nitrogen movement, since reduces fr (2.35±0.05) and μ (0.498±0.050 h-1) and increases d (41.8±5.5 cm2 h-1), compared to la-b column (2.51±0.03; 1.697±0.084 h-1 and 2.85±1.26 cm2 h-1, respectively). adding carbonate and/or phosphate (base, base/fosf e fosf) results in the highest values for maximum chemical oxygen demand (codmax). the small dna amount extracted from soil bacterial cells suggests that the n adsorption and movement have non biological nature, or that the high leachate liquid cod is prejudicial to soil microorganisms.